1) For the burgers using a blender roughly chop the onion , ginger , garlic , coriander and green chillies by pulsing or chop them all by hand. place into a bowl with the lamb mince then add the cumin , garam masala , salt , egg and bread crumbs and mix well.

2) Shape into 6 burgers and chill in the fridge for 20 mins or until you are ready to cook them. Take them out of the fridge 30 mins before you start cooking.

3) Meanwhile for the herbed yoghurt mix together all the ingredients for the herbed yoghurt in a bowl and season to taste with salt and pepper.

4) Preheat the grill to high, place the burgers on a well oiled baking sheet and cook for about 4 to 5 mins on each side.

5) While the burgers are cooking heat the buns in the oven for the last 3 to 4 mins of the cooking time.

6) To serve split the buns in two, place a burger onto one half of each bun on a bed of lettuce. Top with the tomatoes and onion rings and a spoonful of the herbed yoghurt, finish with the other half of each bun.